Lat-Lon Solar Tracking Unit User's Manual And Installation Instructions
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OPTIONAL SENSORS:STU IMPACT DETECTIONOverviewThe STU/I is equipped with a 35G accelerometer and is programmed with a 10Hz and 100Hz levelfilter.Standard impact thresholds are:1G 10Hz5G 100Hz5DV (delta velocity)These thresholds can be changed over the air via the Lat-Lon website (see the Website Manual formore information)Below is a chart of a high G force, short interval impact. The force measured at 100Hz was 18.0G’sand the force measured at 10Hz was 1.5G’s. Because of the short interval the 10Hz filtering (1/10 ofa second) averages out the large spike of data. The difference between the two filters will be largeduring this type of impact.Delta-Velocity (or DV) is the sum of the accelerations during the impact event. More technically, itis the integral of the acceleration over time. The DV measures the net change in speed associatedwith the impact event. For a railcar coupling to another railcar, the DV will be approximately theapproach speed between the two cars. This becomes less true if the car being hit moves after beinghit. In this case the change in speed is less than the approach speed because the approaching car didnot come to a stop, but only slowed down during the impact.High-G, short interval impact100Hz and 10Hz G's vastly different-10-505101520250 0.05 0.1 0.15 0.2 0.25Time (sec)Accel (G) and Delta-V (MPH)Impact event data18.0 G's (100Hz)1.50 G's (10Hz)1.2 MPH Delta-VDelta-V10Hz GActual and100Hz G |
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